Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ca05900dc28c2f…

MALICIOUS

PDF

35.9 KB Created: 2020-04-11 20:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b6bab27376db8127371d90a50a498c58 SHA-1: 8abe8b1e89cfec60e0826087bf7f330b19d3148d SHA-256: 62ca05900dc28c2f5d44280f972ef7d7512ef050e838f124edc5181dc3bb2bb7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many of which point to domains that appear to be part of a link farm or SEO scheme. The document body, though partially corrupted, contains text related to medical conditions, suggesting a lure to attract clicks. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://independenteyesrc.com/uploads/1/3/1/0/131070926/131070926.html#cardiopatias+cianoticas+congenitas
    • http://ptinscottsdale.com/uploads/1/3/0/5/130551559/763da03.pdf
    • http://jasmithdevelopmentsltd.com/uploads/1/3/1/4/131452778/346796b7db17f.pdf
    • http://ryersonbtm.solutions/uploads/1/3/1/3/131379049/5704361.pdf
    • http://creolejamaica.com/uploads/1/3/1/4/131437976/3907309d11.pdf
    • http://eurai.online/uploads/1/3/0/6/130621864/jozosesadodis.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062ad.bin
361a32baf46c450bcedadd2b4e224077b4ba0f1be658cea145b513558cb60540		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62AD 9628 bytes

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